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CYB6_PROMM
ID   CYB6_PROMM              Reviewed;         218 AA.
AC   Q7V5B9;
DT   19-JUL-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2003, sequence version 1.
DT   03-AUG-2022, entry version 113.
DE   RecName: Full=Cytochrome b6 {ECO:0000255|HAMAP-Rule:MF_00633};
GN   Name=petB {ECO:0000255|HAMAP-Rule:MF_00633}; OrderedLocusNames=PMT_1649;
OS   Prochlorococcus marinus (strain MIT 9313).
OC   Bacteria; Cyanobacteria; Synechococcales; Prochlorococcaceae;
OC   Prochlorococcus.
OX   NCBI_TaxID=74547;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 9313;
RX   PubMed=12917642; DOI=10.1038/nature01947;
RA   Rocap G., Larimer F.W., Lamerdin J.E., Malfatti S., Chain P., Ahlgren N.A.,
RA   Arellano A., Coleman M., Hauser L., Hess W.R., Johnson Z.I., Land M.L.,
RA   Lindell D., Post A.F., Regala W., Shah M., Shaw S.L., Steglich C.,
RA   Sullivan M.B., Ting C.S., Tolonen A., Webb E.A., Zinser E.R.,
RA   Chisholm S.W.;
RT   "Genome divergence in two Prochlorococcus ecotypes reflects oceanic niche
RT   differentiation.";
RL   Nature 424:1042-1047(2003).
CC   -!- FUNCTION: Component of the cytochrome b6-f complex, which mediates
CC       electron transfer between photosystem II (PSII) and photosystem I
CC       (PSI), cyclic electron flow around PSI, and state transitions.
CC       {ECO:0000255|HAMAP-Rule:MF_00633}.
CC   -!- COFACTOR:
CC       Name=heme; Xref=ChEBI:CHEBI:30413;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00633};
CC       Note=Binds 2 heme groups. One heme group is bound covalently by a
CC       single cysteine link, the other one non-covalently. {ECO:0000255|HAMAP-
CC       Rule:MF_00633};
CC   -!- SUBUNIT: The 4 large subunits of the cytochrome b6-f complex are
CC       cytochrome b6, subunit IV (17 kDa polypeptide, PetD), cytochrome f and
CC       the Rieske protein, while the 4 small subunits are PetG, PetL, PetM and
CC       PetN. The complex functions as a dimer. {ECO:0000255|HAMAP-
CC       Rule:MF_00633}.
CC   -!- SUBCELLULAR LOCATION: Cellular thylakoid membrane {ECO:0000255|HAMAP-
CC       Rule:MF_00633}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_00633}.
CC   -!- MISCELLANEOUS: Heme 1 (or BH or b566) is high-potential and absorbs at
CC       about 566 nm, and heme 2 (or BL or b562) is low-potential and absorbs
CC       at about 562 nm. {ECO:0000255|HAMAP-Rule:MF_00633}.
CC   -!- SIMILARITY: Belongs to the cytochrome b family. PetB subfamily.
CC       {ECO:0000255|HAMAP-Rule:MF_00633}.
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DR   EMBL; BX548175; CAE21824.1; -; Genomic_DNA.
DR   RefSeq; WP_011131016.1; NC_005071.1.
DR   AlphaFoldDB; Q7V5B9; -.
DR   SMR; Q7V5B9; -.
DR   STRING; 74547.PMT_1649; -.
DR   EnsemblBacteria; CAE21824; CAE21824; PMT_1649.
DR   KEGG; pmt:PMT_1649; -.
DR   eggNOG; COG1290; Bacteria.
DR   HOGENOM; CLU_031114_0_2_3; -.
DR   OMA; WATQTGM; -.
DR   OrthoDB; 1339825at2; -.
DR   Proteomes; UP000001423; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0031676; C:plasma membrane-derived thylakoid membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045158; F:electron transporter, transferring electrons within cytochrome b6/f complex of photosystem II activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0015979; P:photosynthesis; IEA:UniProtKB-UniRule.
DR   GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR   CDD; cd00284; Cytochrome_b_N; 1.
DR   Gene3D; 1.20.810.10; -; 1.
DR   HAMAP; MF_00633; Cytb6_f_cytb6; 1.
DR   InterPro; IPR005797; Cyt_b/b6_N.
DR   InterPro; IPR023530; Cyt_B6_PetB.
DR   InterPro; IPR027387; Cytb/b6-like_sf.
DR   InterPro; IPR016174; Di-haem_cyt_TM.
DR   PANTHER; PTHR19271:SF20; PTHR19271:SF20; 1.
DR   Pfam; PF00033; Cytochrome_B; 1.
DR   SUPFAM; SSF81342; SSF81342; 1.
DR   PROSITE; PS51002; CYTB_NTER; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Photosynthesis;
KW   Reference proteome; Thylakoid; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..218
FT                   /note="Cytochrome b6"
FT                   /id="PRO_0000061831"
FT   TRANSMEM        35..55
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   TRANSMEM        93..113
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   TRANSMEM        119..139
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   TRANSMEM        189..209
FT                   /note="Helical"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   BINDING         38
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /note="covalent"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   BINDING         89
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="2"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   BINDING         103
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   BINDING         190
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="2"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
FT   BINDING         205
FT                   /ligand="heme"
FT                   /ligand_id="ChEBI:CHEBI:30413"
FT                   /ligand_label="1"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00633"
SQ   SEQUENCE   218 AA;  24570 MW;  C9881060228D77D8 CRC64;
     MTNSSPVYDW FQERLEIQAI ADDVSSKYVP PHVNIFYCLG GITLVCFLVQ FATGFAMTFY
     YKPTVTEAYS SVSYLMSDVS FGWLIRSVHR WSASMMVLML ILHVFRVYLT GGFKRPRELT
     WVTGVVMAVI TVSFGVTGYS LPWDQVGYWA VKIVSGVPAA IPVVGDFMVE LLRGGESVGQ
     STLTRFYSLH TFVLPWLLAV FMLMHFLMIR KQGISGPL
 
 
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